Wow, this is my favorite hopper. I prefer the Halo over the VLocity mostly because of the looks. The halo b also has more upgrades.
I was thinking about getting the Qloader because it gives you a smaller profile and loads more bps. But a short while later, I realized that you can buy a chip for $25 and it will load just as fast as the Qloader, leaving the Q with just a smaller profile for an advantage.
Overall I don't like the idea of Q only having 100 ball capacity. If it gave more ball room(ha ha) I'd get that but instead i'll get the halo.

Conclusion:

If you need room for more than 100 rounds the Halo B w/rip drive is for you but if you are conservative on your shots get the Q.